I've read everything I could find here, and a bunch elsewhere on the web, about how to debug FRDM-K64F code over its USB interface, to no avail. Somewhere I read that you're supposed to use the "GDB OpenOCD Debugging" choice in the Debug Configuration dialog. Initially, I got a popup saying "Error in services launch sequence. OpenOCD requires some -c or -f configuration options to start." Somewhere else I found an explanation that I needed to add "-f kinetis.cfg" to the Debugger config options. Now it doesn't pop anything up, but it fails to load anyway. Instead, the OpenOCD console shows the following messages:
Open On-Chip Debugger 0.8.0-dev-dirty (2014-08-20-11:07)
Licensed under GNU GPL v2
For bug reports, read
Info : only one transport option; autoselect 'cmsis-dap'
Error: unable to open CMSIS-DAP device
Error: unable to init CMSIS-DAP driver
Error: Error selecting 'cmsis-dap' as transport
Runtime Error: C:/Freescale/KDS_1.1.1/openocd/bin/..//scripts/kinetis.cfg:3:
in procedure 'script'
at file "embedded:startup.tcl", line 58
in procedure 'interface' called at file "C:/Freescale/KDS_1.1.1/openocd/bin/..//scripts/kinetis.cfg", line 3
So I'm stumped. The FRDM users guide says nothing about how to debug. Is there some app note somewhere that I've missed? What do I do next?